zones: fix New() to handle relative paths on hackpadfs

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/zones/zones.go

@@ -3,6 +3,7 @@ package zones
 
 import (
 	"io/fs"
+	"path/filepath"
 
 	"github.com/hack-pad/hackpadfs/os"
 
@@ -105,7 +106,12 @@ func NewFS(dir fs.FS, domain string) (*Zones, error) {
 
 // New builds a [Zones] tree using the given directory
 func New(dir, domain string) (*Zones, error) {
-	base, err := os.NewFS().Sub(dir)
+	dir, err := filepath.Abs(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	base, err := os.NewFS().Sub(dir[1:])
 	if err != nil {
 		return nil, err
 	}